Bolt not included!!! Fitment Guide: Compatible Equipment Make: Replacement for Bobcat Model: 334, 425, 325, 328, 225, 430, 329, 335, 331, 428, E42, E25, E26, E32I, E32, E35I, E35, E35Z, E37, E34 Part Type: Bottom Roller Compatible Equipment Type: Excavator Roller Specifications: Bottom Roller Weight：19.84 pounds Package Dimensions：5.51"X5.51"X8.26" Item Package Quantity：1x Bottom Roller(Bolt not included) Color: Black Material: 50 MnB Steel Surface Hardness: HRC52-58, Deepth:5mm-10mm Locking pin, 65Mn or 45 carbon steel, hardened HRC25-28. Bolt, grade 12.9, HRC45-52. 6. Seal: Nitrile rubber. Operating temperature range -20℃ to 110℃. Finish: Smooth Technique: Forging and Casting Note:Please confirm the item if it matches your need before you purchase. Track Roller Features: 1. Wheel body forged from 50Mn round steel with good hardenability. The heat treatment process of quenching and tempering and medium frequency surface quenching ensures its strength and wear resistance. two pieces roller shell rim. Heat treated shells for body strength and longer wear life. Heat treated for a deep uniform hardened depth that provides wear life equal to link wear life. 2.Roller shaft shaft and bearing designed to carry and turn with heavy track weight forged and heat treated for strength. Bearing surfaces are hardened and polished to reduce friction and wear. Center flange absorbs side thrust from roller shell. 3.Cast Iron bushing Supports the bronze sleeve bearing. Cast from iron to absorb loads without permanent deformation. Large lubricant reservoir to reduce heat build up. 4.Bronzed sleeve bearing Sleeve design provides a large surface area for better load distribution. Inner diameter surface is polished to a smooth finish. Soft bronze coating in the bearing absorbs any small foreign particles before they can damage the shaft and seals.